keith



Patented Jan. 3, |839.'

5 Sheets-Sheet I.

J. KEITH.

GAS PUMP 0R CUWIPRESSR.

(Application filed Apr. 12, 1898.5

(No Model.)

N0. 6l7,026. Patented lan. 3, |899. l I J. KEITH.

` GAS PUMP 0R COMPRESSR.

l (Application med Apr. 12, 199s.)

(No Model.) 5 Sheets-Sheet 2.

. 1H: Nonms Paws ao.. Pwnrom'nov. wAsHwuYon, o. n.

No. 617,026. Patented 1an. 3, |899. J. KEITH.

GAS PUMP 0R CUWIPRESSUR. (Application filed Apr. 12, 1898.) (N0 Model.) 5 Sheets-Sheet 3- No. 617,026. Patented 1an. 3, |899. J. KEITH.

GAS PUWIP 0R COMPRESSOR.

(Application led Apr. 12, 189.8.) (No Model.) 5 Sheets-Sheet 4.

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No. 6|7,026. Patented lan. 3,1899.

J. KEITH. GAS PUMP GB COMPRESSOR.

(Application led Apr. 12, 189B.)

(No Model.) 5 Sheets-Sheet 5- me xmms PETERS co, wow-uma., wAsHmnTon. o. c.

Nrrn @rares JAMES KEITH, OF LONDON, ENGLAND.

GAS PUIVIP OR COMPRESSOR.

SPECIFICATION forming part of Letters Patent No. 617,026, dated January 3, 1899.

Application filed April 12, 1898. Serial No. 677,365. (No model.)

To all whom t may concern:

Be it known that I, JAMES KEITH, of 27 Farringdon avenue, in the city of London, England, have invented new and useful Improvements in Gas Pumps or Compressors, of which the following is a specification.

This invention relates to apparatus for increasing the pressure of gas or for forcing air; and it has for its object the economy of the water used in working such apparatus.

The improved apparatus consists of a compressing-pump actuated by a water-motor, the pump part being made in the form of a gas holder or bell dipping^in an annular water-space formed around a closed cylinder and serving by its reciprocation within the cylinder to alternately draw in and expel gas or air at either end, being thus double-acting, (but it might be single-acting,) the gas or air passing thence to a gas holder or receiver loaded to maintain the desired pressure. The gas holder or receiver, which rises and falls according as the gas is drawn off for consumption, is connected to a regulating cock or valve which controls the admission of water to the motor. When the holder rises on being filled with gas, the water is cut oif from the motor, and as the holder falls the valve is more or less opened to admit water to actuate the motor, whereupon the compressor again charges the gas-holder. The pump is in this Way actuated only to maintain the supply of gas in the holder at a pressure determined by the load upon it, and only the water passing into the motor while it is in operation'is used.

In the accompanying drawings, which illus-` trate the invention, Figure l is a vertical section of the improved apparatus. Fig. 2 is an elevation at right angles to Fig. l, and Fig. 3 is a plan of the same. Figs. 4 and 5 are sectional views on the lines @c and f1] y, respectively, of valve arrangements hereinafter referred to.

As represented in the drawings, the improved apparatus comprises a pump, which consists of a cylinder A, provided with an annular water-space a, which is formed between the cylinder proper and an inner openended cylinder A and into which Waterspace a small gas-holderB dips. The water in ct acts as a seal, and when the -holder B is moved up and down by means of the watermotor C, forming part of the apparatus and hereinafter described the gas or air to be compressed is alternately drawn in and eX- pelled both above and below the holder or oat B, the gas being drawn through inletpipes D G into the cylinder A and expelled through the same pipes. The spaces above and below the float B are connected to a Valve-chamber E, having suitable inlet-valves e c and discharge-Valves c2 e3 for each space. The upper side of the cylinder A is connected by a pipe Gand port G to the part of valve-box E containing the suction and delivery valves e and e3, respectively. Similarly, the under side of the cylinder is connected by a standpipe D and port D, cast in the base, to a separate compartment of the valve-box containing the suction and delivery valves e e2. The annular water-space a is kept charged with water from the exhaust-pipe c of the motor, which is led into the cylinder near the bottom of this space and overflows into the center of the cylinder A. This water iills up the interior of the cylinder A' to the height of an overflow-pipe F, situated in the cylinder and forming a deep trap to prevent the gas from being blown out, and the overflow- Water passing in the direction shown by the dotted arrows, Fig. l, through the pipe F, as shown in dotted lines, Figs. l and 3, is or may be discharged from the trap at about the level of the overflow in the cylinder.. The water in the annular space a. rises and falls alternately on the inside and outside of the holder to a height equal to the difference in pressure on the inside and outside of the holder. The gas-supply is connected to the two suction-valves c e', and the two deliveryvalves e2 e3 discharge by a port 7 and standpipe J into a gas-holder L, placed alongside the cylinder and loaded to the desired pressure by a ring M on the bottom and supplementary weights N on the top, these top weights serving to adjust the pressure. The

pump part is operated by the water-motor C, fixed directly on the top of cylinder A.

The water-motor C is of the double-acting dierential type described in the specification of my United States Patent No. 584,266, and its action is regulated by means of the smally weighted gas-holder L, into which the com- IOO pressed gas is pumped. As the holder L rises it is arranged to act on the lever U of a regulating valve or cock V, which is fixed on the Water-pipe W, leading to the motor, the cock V being closed when the holder L rises and being opened when the holder falls, according to consumption of the gas. The waste water which passes from the overflow-pipe F of the pump-cylinder A is made to run into the tank L', in which the holder L iioats, and overflows inally at X, so as to keep it properly charged with water and keep it pure.

I-Iaving now described the invention, what I claim, and desire to secure by Letters Patent, is-

In combination the Water-motor, the pump comprising the oylinderand bell, a gas-holder L with its bell, a pipe D extending from the upper part of the pump but below the top of the bell and connecting with the gas-holder L, a second pipe Gr extending from the pump at a point above the bell thereof and con necting with the said gas-holder L, an inner cylinder A between which and the pumpcylinder the bell of the pump dips, a valvecasing E in the pipe connections between the pump and gas-holder and the two sets of suction and delivery valves in said valve-casing one set being for the pipe D and the other set being for the pipe G, substantially as described. Y

In Witness whereof I have hereunto set my hand in presence of two witnesses.

JAMES KEITH.

Titnessesz WALLACE FAIRWEATHER, J No. ARMSTRONG, J unr. 

